EPS Bearer Terminology in LTE

EPS Bearer Terminology in LTE
Quality of service
  • GBR bearer: Guaranteed bit rate
  • Non-GBR bearer: No guaranteed bit rate

Establishment time
  • Default bearer
  • Established when UE connects to PDN
  • Provides always-on connectivity
  • Always non-GBR
  • Dedicated bearer established later
  • Can be GBR or non-GBR
Every EPS bearer
  • QoS class identifier (QCI): This is a number which describes the error rate and delay that are associated with the service.
  • Allocation and retention priority (ARP): This determines whether a bearer can be dropped if the network gets congested, or whether it can cause other bearers to be dropped. Emergency calls might be associated with a high ARP.